La aplicación de transmisión rápida de iOS no reproduce música en modo de fondo

Mi aplicación está funcionando bien, pero en cuanto la caja fuerte de la pantalla está encendida o al hacer otra cosa en el iPhone, la transmisión se detiene. Activé los modos de fondo "está reproduciendo audio" pero no ayuda.

Este es mi ViewController.swift

import UIKit
import MediaPlayer

class ViewController: UIViewController {
    let player: MPMoviePlayerViewController = MPMoviePlayerViewController(contentURL: NSURL(string: "http://url to my stream"))

    override func viewDidLoad() {
        super.viewDidLoad()
        // Do any additional setup after loading the view, typically from a nib.
        player.moviePlayer.movieSourceType = .Streaming
        self.presentViewController(player, animated: true, completion: nil)

        loadAddressURL()
    }

    func stop() {
        player.moviePlayer.stop()
    }
    @IBAction func Hitplay(sender: AnyObject) {
        player.moviePlayer.play()
    }

    @IBAction func Hitpause(sender: AnyObject) {
        player.moviePlayer.stop()
    }

    @IBOutlet var Nowplay: UIWebView!
    var URLPath = "http://url to on air now"

    func loadAddressURL() {
        let requestURL = NSURL (string:URLPath)
        let request = NSURLRequest (URL: ,requestURL!)
        Nowplay.loadRequest(request)
    }
}

y aquí está mi info.plist

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-      1.0.dtd">
<plist version="1.0">
<dict>
 <key>CFBundleDevelopmentRegion</key>
 <string>en</string>
 <key>CFBundleExecutable</key>
 <string>$(EXECUTABLE_NAME)</string>
 <key>CFBundleIdentifier</key>
<string>com.product name.$(PRODUCT_NAME:rfc1034identifier)</string>
<key>CFBundleInfoDictionaryVersion</key>
<string>6.0</string>
<key>CFBundleName</key>
<string>$(PRODUCT_NAME)</string>
<key>CFBundlePackageType</key>
<string>APPL</string>
<key>CFBundleShortVersionString</key>
<string>1.0</string>
<key>CFBundleSignature</key>
<string>????</string>
<key>CFBundleVersion</key>
<string>1</string>
<key>LSRequiresIPhoneOS</key>
<true/>
<key>UIBackgroundModes</key>
<array>
    <string>audio</string>
</array>
<key>UILaunchStoryboardName</key>
<string>LaunchScreen</string>
<key>UIMainStoryboardFile</key>
<string>Main</string>
<key>UIRequiredDeviceCapabilities</key>
<array>
    <string>armv7</string>
</array>
<key>UISupportedInterfaceOrientations</key>
<array>
    <string>UIInterfaceOrientationPortrait</string>
    <string>UIInterfaceOrientationPortraitUpsideDown</string>
</array>
</dict>

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